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CpanelApplication

CVE-2020-26113

MEDIUM · 6.1 CVSS v3.1 Published 2020-09-25
Fix available
A fix is available. Upgrade to 90.0.10 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
cPanel before 90.0.10 allows self XSS via WHM Manage API Tokens interfaces (SEC-569).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Self XSS vulnerability in cPanel's WHM Manage API Tokens interface allows authenticated users to inject malicious JavaScript through the interface that executes in their own browser session. The vulnerability exists in versions before 90.0.10.

MitigationUpdate cPanel to version 90.0.10 or later. As a self XSS, this vulnerability only affects the authenticated user themselves, reducing overall severity, but should still be patched promptly.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
CpanelApplication
Affected:< 90.0.10

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed cPanel version
    Run the command 'whmapi1 version' or check /usr/local/cpanel/version on the server
    Affected if The version number is lower than 90.0.10 (e.g., 89.0.0, 88.x.x, etc.)
  2. Check cPanel release tier
    Run 'cat /var/cpanel/releases' or check /var/cpanel/releases/ for available release directories
    Affected if The installed release is before version 90.0.10
  3. Verify WHM access exists
    Confirm the server runs WHM (Web Host Manager) by checking if the /usr/local/cpanel/whostmgr/docroot/ directory exists
    Affected if WHM is installed and the Manage API Tokens interface is accessible to authenticated users
  4. Confirm API Token interface usage
    Log into WHM and navigate to 'Development' > 'Manage API Tokens' or access /whm-api-token-manager/ endpoint
    Affected if The interface is accessible and the cPanel version is below 90.0.10

If the installed cPanel version is below 90.0.10 and the WHM Manage API Tokens interface is accessible to authenticated users, the environment is affected by this self-XSS vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to 90.0.10 or later
Fixed in 90.0.10
Interim mitigation

Update cPanel to version 90.0.10 or later. As a self XSS, this vulnerability only affects the authenticated user themselves, reducing overall severity, but should still be patched promptly.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing3.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,570
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,512.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-26113 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data